Dead-locking mechanism for door latches



DEAD LOCKING MECHANISM FOR DOOR LATCHES March 26, 1929. L, L, GASEY 1,706,486

DEAD LOCKING IIECHANISM FOR DOOR LATCHES Filed nay 19.1927l 2 shuts-sheet 2 r. g. L?. /37

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i ated the retraction of the latch bolt is effect- Patented Mar. 26, 1929.

UNITE-D STATES LEO LESTER GrASEY,` CHICAGO, ILLINOIS.v

DEAD-LOCKING'MEGHANISM FOR DOOR LATCI-IES.

Application mea May 19,

This invention relates to door latches of that type in which the latch bolts are equipped with anti-frictionl members or levers adapted' to be operatedby the strike plates during the closing of the doors to effect the retraction of the latch bolts, and more particularly to dead locking orv dogging mechanisms for devices of this kind.

The invention has for one of its objects to simplify and improve the general construction of dogging mechanisms and to provide one which shall have all the parts thereof hidden withinl the lock casing and which shall be adapted to be controlled by the anti-friction member or lever ina manner to effect the dead locking or clogging of the latch bolt when the door reaches its fully closed position.

VViththe foregoing and other objects in view, the nature of which will become apparent as the description proceeds,lthe 1nvention consists of the novel'construction,

Figure 1 is a view partly in elevation andpartly in vertical section of 'a latch embodying my invention, the clogging mechanism being shown in inactive position,

Figure 2 is asimilar View with ging mechanism in active position, and v Figure 3 is a detail sectional view taken on the horizontal plane indicated by the line 3--3 of Figure'l. v

The invention is `illustrated applied to a latch which embodies a casing 1 havinga face plate 2 and provided in the upperright hand corner thereof with an opening 3 for the reception of a cylinder key lock mechanism. The bolt of the latch comprises a head piece 4 passing through an opening 5 in the face plate 2 and provided with a dogging shoulder' 6, and a tail rod 7 connected to the headgpiece and provided at itsmnerend with a cross head 8. The latch bolt isnor Vmally heldprojectedby a coil v springt) which'is mounted on the tail vrod 7 vbetween,

the head'piece 4anda bearing 10 provided for thetail rod andV carried by a side of the.

casing 1. When the key mechanism is opered in the manner hereinafter set forth. The knob mechanism of the latch comprises a lever 11 and a split hub'12. rIhe lever 11 is Apivoted at its lower end on av stud 13 carried 1927. serial No. 192,631.

by a side of the casing 1. The upper end of the lever 11 is positioned outwardly of the cross heady 8 and, when a knob is turned, engages the cross head to effect the retraction of the `latch bolt. A spring 14 holds the lever 11 in normal position with its upper end outwardly of the cross head 8 and 1n contact with, the bearing 10. One of the members of the split hub 12is adapted to` be locked so as to prevent the retraction of the latchfbolt by one of the knobs, and the mechanism for accomplishing this comprises a bolt 15 which is adapted to be moved into and out of engagement with such hub member through the medium of plungers `16 and 17. rlhe plungers 16 and 17 are accessible through openings 18 and 19 in the face plate 2. The plunger 16 is connected directly to the bolt 15, and theplunger 17 is connected thereto by a pivoted lever 20. The latch bolt is of the anti-friction type, and the antifriction member or lever 21 thereof is positioned in a slot 22 which extends through the outer end and sides Aof the head piece 4. The lever 21 extends beyond the outer end4 and sides of the head piece 4, and is connected at one end by-a pivot 28. toa side of the casing 1. Y I

The dead locking'. or clogging mechanism y of the `latch comprises an angular clogging the dog-l lever 24 which is mounted, Vat the point of connection of its arms 25 and 26 and below the latch bolt, upon a pivot 27 carried by a side of the casing 1. The arm l25 extends outwardly for engagement with the `clogging shoulder 6 of the head piece 4 when the dogging lever 24 is in active position, and the arm 26 extends upwardly to a point above the tail rod .7.v When the clogging lever 24, which is held in inactive position in the manner hereinafter set forth, is released a spring not shown functions-to move it into and hold it in active position. A lever 28 which is mounted ona pivot 29- carried by a wall' of the casing 1 and has an upwardly extendingl onthe knob .lever 1,1. The operation of thef lever 28 by either the key mechanism. or knob mechanism effects the movement. of the dogglngk lever 24 from its active into its in- 4, all as shown in Figure 1.

A. spring pressedL lever 33 which lis ofv angular formation is mounted at one end upon a pivot 34 carried by a side of the casing 1. The pivot 34 is located outwardly of and above the clogging lever arm 26, and the lowei' free end of the lever 33 contacts with the concave inner side portion 26a of'said arm when this lever is in inactive position.

A spring 35 secured to the lever 33 and contacting with the top of the casing 1, urges the lever 33 downwardly and outwardly, and said lever when in active position urges the clogging lever 24 downwardly and inwardly, to hold the clogging lever in inactive position. These movements of the levers 24 and 33 are limited by a stop 36 carried by a side of the casing 1 and positioned below the clogging lever arm 25. vThe lever 33 is provided at its upper edge with a flange 37 which is provided in its under side'with a notch 38. A lug 39 is secured yto the lever 33 inwardly of and below the notch 38, and an arcuate leaf spring 40 is fixed atone end to the lug and has its free end removably positioned in the notch.

An angular lever 41 is mounted at the juncture of its arms 42 and 43 upon a pivot 44 which is carried by a side of the cas-ing 1 and located outwardly of and in a plane situated between the'pivots 27 and 34. The arm 42 extends `downwardly and contacts with the inner sides of the anti-friction lever 21 and a lug 4n projecting from the vhead piece 4. The arm 43 extends upwardly and inwardly, and .is provided with an angular end 45 which, when the lever 41 is in inactive position with respect to the'lever 33, is situated below and inwardly of the lug 39. The leve-r 41 is constantly urged downwardly and outwardly by a spring 46. The antifriction lever 21 is provided with a slot 47 through which passes a vertical pin 48 carried by the head piece 4. The slot 47 is wider than the diameter of the pin 48 so as to permit the anti-friction lever 21 to be moved inwardly for a slight distance with respect to the head piece 4.

Vhen the head piece 4 and the anti-friction member 21 are out of engagement and contact with the strike plate, as would Voccur when the door is opened, the restraining lever 33 and its spring 35'hold the cloggingV lever 24 in inactive position, the spring 46 holds the releasing lever 41 in inactive position, andthe releasing lever 41 and spring 46 hold the anti-friction lever 21 in fully projected position with respect to the head piece y The clogging lever arm 25 is now out of contact with the clogging shoulder 6, the angular end 45 of the releasing lever arm 43 is now positioned below and inwardly of the lug 39 and the spring 40, and the releasing lever arm 42 is` now in contact with the inner side of the anti-friction lever 21 and lug 4a. When, as would occur when the door is being closed, the anti-friction lever 21 contacts with the strike plate it moves inwardly. During the first phase of its inward movement, the antifriction lever 21 travels with respect to the head piece 4 and moves the releasing lever 41 in an upward and outward direction for a short distance-` The anti-friction lever 21 is now in contact with the pin 48 and during the remainder of its inward travel moves `the head piece 4 inwardly. travel the head piece 4 moves the releasing During its inward lever 41 through the remainder of its distance in this direction, and this movement of the releasing lever is effected 'through the medium of the lug-4a which is carried by the head piece and contacts with the outer side of the releasing lever arm 42. Dur-ing this movement of the releasing lever 41, the angular end 45 thereof passes upwardly and outwardly beyond the spring 40, thefree end of the spring moving downwardly out of the notch 38 Ato permit the angular end of the lever to pass 'by the spring. llVhen the head piece 4 moves outwardly into the slot in the `strike plate provided therefor, the lug 4a is carried out of contact with v the releasing lever a-r-m 42. This slot is not wide enough to permit the complete entrance there-into of the anti-frictio-n lever 21, but is wide enough to permit the anti-friction lever to move outwardly for a short distance under tlre influence of the spring 46. The simultaneous outer side of the spring 40. When the rei leasing lever 41 comes to rest, the an, ;u'lar end 45 thereof is directly opposite the lug 39, with the result that the restraining lever 33 is positively held in inactive position;V :The parts occupy the positions shown in Figure 2, and will remain in these posit-ions until the latch bolt is retracted by the key mechanism or the knob mechanism. "With 'the parts in these positions, the latch bolt is held against retraction by an instrument in-` serted between the plate. v

During the operation of thekn'ob mechanism or the key niechanisimthe lever 28 is Vface plate 2 and strike rocked in a direction to move itsarm 30 l Cil downwardly and outwardly and this takes place immediately before and during the first phase of the inward movement of the `latch belt. This movement ol the lever 28 moves the clogging lever 2liinto inactive position before the lnob or key operated mechanism contacts with the cross head oi' the latch bolt and holds the clogging lever in this position until the mechanism contacts with the cross head 8 and retracts the latch bolt sutiiciently to carry its shoulder inwardly beyond the outer end of the clogging lever arm 25. Then the door is opened tar enough to carry the head piece et and anti-friction lever 2l out of contact with the strike plate, the spring i6 moves the anti-friction lever and the releasing lever il into their normal positions. This movement of the releasing lever 1 1 carries the angular end 45 thereof downwardly out of contact with the spring 40, freeing the restraining lever 33 for actuation Vby the spring 35. This actuation of the restraining lever 33 results in the movement of the clogging lever 24 into inactive position. lVhen these levers come to rest, the spring occupies a position which permits the angular end of the releasing lever 4l to move upwardly and outwardly with respect thereto and thence downwardly and inwardly in contact with the outer side thereof, when the door is again closed with the resulting freeing of the-clogging lever 24C for movement into active position.

It should be understood that the drawings are merely illustrative and do not pretend to give exact proportions. Furthermore, the said drawings are illustrative of a preferred construction, ity being my expectation that various changes and modifications may be made without departing from the spirit and `scope of my invention. f

What is claimed is ll. A latch including a latch bolt, an antifriction member carried by the latch bolt and adapted to have an inward movement independently thereof for a limited distance, a lug carried bythe latch bolt, a dogging lever for the latch bolt adapted when released to move into active position, a restraining lever contacting with the clogging lever, a spring fixed at one end to the restraining lever, a releasing lever having an arm contacting with the anti-friction member and lug and having an arm provided with an angular end occupying a position below and inwardly ofy the spring, and springs bearing on the restraining and releasing levers.

2. A latch including a latchv bolt, a dogging lever for the latch bolt adapted when released to move into an active position, a restraining lever adapted when in active position to hold the clogging lever in inactive position, Va member carried by the restrainmg lever, a releasing lever having an angular end adapted to occupy a position below and inwardly of said member when the restraining lever is in said position and retractible mea-ns carried by the latch bolt and adapted to operate the releasing lever during the retraction thereof and of the latch bolt to carry its angular end upwardly and thence downwardly with respect to said member so as to move and hold the restraining lever in inactive position.

In testimony whereof I aiiiX my signature.

LEO LESTER GASEY. 

